Correct the mistakes in the sentences. they were friends since 1997. how long has she wrote this book? the boys are looking for the treasure for six months already i know her all my life. what did they do since we left?

They have been friends since 1997. 
How long has been she wrote this book? 
The boys have been looking for the treasure for six months already 
I have been knew her all my life. 
What have been they doing since we left?

They have been friends since 1997.
How long was she writing this book?
The boys have looking for the treasure for six month already.
I knew her all my life.
What have they done since we left?